James Hardie document
HardiePanel Compressed Sheet Technical Specification
The official James Hardie installation guide for HardiePanel Compressed Sheet, a dense compressed fibre cement sheet used to build water resistant and waterproof external decks over timber or steel frames. It covers deck fall and drainage, joist spacing and fixing, sealed sheet joints, flexible sheet and liquid membrane waterproofing, and tiling. Read it on this page or download the PDF.
What this covers
- Deck Fall & Drainage
- Joist Spacing & Sheet Thickness
- Fixing & Screw Set-Out
- Sealed Sheet Joints
- Waterproofing Membranes
- Tiling & Finishes
Key things to remember
The essentials from this guide, at a glance.
- Decks must have a fall of at least 1 in 100 to avoid ponding, with a step down of at least 50mm and preferably 150mm from the door sill.
- Maximum joist centres are 450mm for 15mm sheet and 600mm for 18/24mm sheet.
- Sheet joints must have a minimum 5mm gap, sealed over a 10mm backing rod with James Hardie joint sealant.
- Fix to timber with No. 10x50mm Type 17 screws kept at least 12mm from sheet edges and 50mm from corners.
- Sheet sizes are 2400x1200mm in 15/18/24mm and 3000x1200mm in 15/18mm, with a density of about 1620kg/m3.
- Compressed sheets cannot be left raw, and a water resistant deck that is not tiled must have a durable coating applied.
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This is the official James Hardie HardiePanel Compressed Sheet Technical Specification. Read it on this page or download the PDF. For the most current version, please confirm with James Hardie. Allmat supplies the HardiePanel Compressed Sheet range across Adelaide and South Australia. See sizes and add it to a quote.